Taylor Swift to sell tickets to tour rehearsal in Nashville as fundraiser for tornado victims (video)

Taylor Swift is one of the biggest stars in the music business. But you knew that already. (Special)

BIRMINGHAM, Alabama -- Taylor Swift's dress rehearsal for her "Speak Now" tour -- May 21 at Nashville's Bridgestone Arena -- has become a fundraiser for tornado victims in the Southeast.

About 13,000 fans will be able to buy tickets to the concert, called "Speak Now ... Help Now!"

Update: Tickets for the 7:30 p.m. rehearsal are $50, on sale at 10 a.m. May 12 via Ticketmaster and Swift's official website.

All proceeds will go to the Speak Now … Help Now Fund established through the Community Foundation of Middle Tennessee. Attendees will receive a free commemorative T-shirt.

“I was watching the coverage of the tornadoes backstage at rehearsals, and I wanted to do something for the families affected by the damage,” the pop-country star said in a prepared statement. “I’ve never opened a rehearsal to the public before, but I felt that inviting my fans to the last rehearsal ... would be a great way to raise money."

Swift said she's been working on her show at the arena for five weeks, and is likely to do some "fine-tuning" at this final rehearsal. Folks who attend will get a sneak peek at the production, which begins its travels on May 27 in Omaha, Neb.

Updated May 9 with ticket information and details on where proceeds will go.